Vaporizing apparatus



INV EN TOR.

H. R. STAGNER VAPORIZING APPARATUS 3 Sheets-Sheet l Filed Feb. 19, 1949 HA: LTON R. mmm BY' ggg [3 ATTO/UVEK Dec. 4, 1951 H. R. STAGNER 2,576,976

VAPORIZING APPARATUS Filed Feb. 19, 1949 l 5 Shee'rs-SheefI 2 Dec. 4, 1951 H. R, STAGNER vAPoRzING APPARATUS 5 Sheets-Sheet 3 Filed Feb. 19, 1949 nur 16;# (16d F1a 7 l JNVENTOR.

HAMILTON RSTAGNER.

l (Zw. 6- 04m Patented Dec. 4, 1951 UNITED STATES PATENT OFFICE VAPORIZIN G APPARATUS Hamilton R. Stagner, St. Louis, Mo.

Application February 19, 1949, Serial No. 77,433

(Cl. 21S-39) 16 Claims. l.

This invention relates to a portablev apparatus for: transforming various. kinds of material into a vapor, whereby the latter may be discharged and employed to attain certain benecial results, dependent on the kind of material; that is, the ingredients ofV the materialy whether it consists of a compound, a solution or a mixture. The apparatus, as illustrated, is adapted to hold a quantity of the material in the liquid state for supply to the vaporizing mechanism.

The discharged vapor may be used to diffuse the atmosphere in a substantially closed area, such as a room and/orY for treating materials therein. If' the liquid is an insecticide, the vapor maybe applied on or'over plants, shrubbery and the like, surfaces, and various materials or discharged in a confined area for the purpose of killing; rodent and insect life; if the liquid is a disinfectant, the vapor may be applied to various kinds of materials or discharged into a conned area to neutralize abnormal conditions on such materials or in the conned area ;V or if the liquid is of a medicinal character, the vapor may be discharged into a room orr other area, whereby a person therein may inhale the diffused medicated atmosphere to take advantage of the medicinal properties of the liquid.

The apparatus includes a tank or reservoir for the liquid, a vaporizing means having a vapor discharge nozzle anda driven pump adapted to continuously supply liquid to the vaporizing means so long as power is applied to the pump driving mechanism.

Accordingly, in one application of the apparatus, as it operates automatically, it may be placed in a room, which is to be'disinfected or the atmosphere therein treated and set in operation by a remotely located electric switch, so that the attendant is not required to be in the room to start or stop the apparatus or remain there during its operation; and by providing a time controlled switch, as herein disclosed, the apparatus may be set to operate for a. period of predetermined duration dependent upon the volumetric area of the room and/or for other reasons.

The apparatus also includes a thermostat controlled by the heating of the walls of the Vaporizing chamber or chambers to a predetermined temperature to close a circuit to the pump motor, whereby the pump is inoperative until these walls are heated to a temperature which is effective to vaporize the liquid.

The apparatus, as disclosed herein, includes a vaporizing chamber, an electric heater, a pump operated by a thermo-controlled electric motor to supply liquid to the chamberV and a time actuated switch for circuits, whereby the vaporizing chamber is initially heated prior to the operation of the pump, the pump is operated for a period determined by the setting of a time switch and the circuits thereafter opened to stop the motor and cut oli the heating means.

One object of the invention is to provide an improved device of this character having a chamber for the liquid to be vaporized, a Vaporizing means for the liquid, a nozzle for the discharge of the vapor and thermo-controlled mechanism for supplying liquid to the vaporizing means.

Another object of the invention is to provide an improved apparatus adapted to contain a supply of liquid and consisting of a liquid receiving chamberhaving an outlet, a pump for supplying liquid to the chamber, electrical means for heating the walls of the chamber to vaporize the liquid therein and driving the pump and a time controlled switch for circuits for said electrical means whereby, by means of the switch the quantity of liquid supplied to the vaporizing chamber and discharged in the form of vapor may be regulated dependent on the size of the area to be treated or other conditions.

Another object of the invention is to provide a portable apparatus of this character wherein the operation of vaporizing a liquid and discharging the vapor may be carried on automatically for periods of predetermined selected length or duration.

Another object of the invention is to provide an improved apparatus of this character containing a quantity of liquid and means for vapori'zing the liquid to produce a vapor devoid of moisture, which may be discharged in a. room or other area, to treat conditions therein, without danger of spoiling various fabric and other materials in the room or other area.

Other obiects of the invention will be apparent to those skilled in the art to which my invention relates from the followingr description taken in connection with the accompanying drawings, wherein Fig. 1 isa sectional view of an apparatus embodying my invention, on the line I-l of Fig. 2.

Fig. la is a longitudinal sectional View of the pressure reducing means.

Fig. lb is a section on the line Ib-Ib of Fig. 1a.

Fig. 2 is a section on the line 2--2 of Fig. 1.

Fig. 3 is a section on the line 3-3 of Fig. 1.

Fig. 4 is a rear end elevation, parts being broken away.

Fig. 5 is a longitudinal sectional vieW of the thermostat.

Fig. 6 is a sectionA on the line 6 6 of Fig. 5.

Fig. '7 is a view, partly in side elevation and partly in section of one of the heater units.

Fig. 8 is a section on the line 8-8 of Fig. 7.

Fig. 9 is a diagrammatic view of the electric circuits.

In the drawings, I indicates as an entirety an enclosure or casing having a rigid bottom wall Ia, a front end wall lb formed with an opening I c for a purpose later set forth, side walls Id, a top wall I e and a rear end wall If. These walls may be (a) shaped to accommodate and enclose the parts hereinafter referred to and the arrangement thereof or (b) formed in one or more assembled sections and provided with suitable doors or lids when found desirable. In the preferred arrangement, as shown, the walls Ib, I c, Id and I f are formed of a single piece of sheet metal and the walls Ib, Id and I f engage with and are removably secured by screws 2 to anges Ia: provided along the sides and ends of the bottom wall I a.

3 indicates a tank for the liquid to be vaporized as later set forth. The side walls of the tank 3 are provided with supporting devices 3a, preferably of L-shape and welded to these side Walls, resting onthe bottom wall I a. The tank 3 is preferably elongated, its rear end wall being disposed in close relation to the wall If, but is of less length than the bottom Wall Ia to provide chambers 4, 5, between the front wall Ib and front wall of the tank 3, for purposes later set'forth. The partition i5 for the chambers a, 5, is provided at its lower end with a flange Sa to engage the bottom wall I a. The upper end of the partition 5 is bent forwardly as shown at 6:1: and provided withv upstanding marginal walls 5b, to which reference will later be made. The top wall 3b of the tank 3 is formed with a filling opening 3c, in which is suitably mounted, in a liquid tight manner, a bung ring 3d having an eXteriorly screw threaded collar. 'l indicates a cap having threaded engagement with the collar, the cap being provided with a gasket 1a, whereby the opening through the collar of the ring 3d may be sealed when the cap is tightened on the collar. The top wall le of the casing i is provided with a handle Ig, whereby the apparatus may be carried. rThe rear portion of the top wall Ip. is formed with an opening 8, which is alined with the lling opening 3c. to permit accessto the cap 7 when the tank 3 is to be filled. The opening 8 is provided with a closure 8a preferably hinged along one edge to one side of the opening.

9 indicates as an entirety a vaporizing mechanism to which the liquid in the tank 3 is supplied in the manner later set forth. Of the vaporizing mechanism S, 9m indicates an elongated member formed of a material having a relatively high co-efiicient of heat conductivity. for eX- ample. aluminum or aluminum alloy. Themember 9a is formed with a plurality of through onenings ID. In the preferred form of construction, the outer surface of the member 3a is round and the-openings lll are uniformy spaced about the axis of the member Sa. Where the member 9a is of some other shape in cross section the openings I will be spaced about an imaginary axis. The rear end of the member Sa -is provided with a plate i I, suitably removably bolted to the member 9a and formed with through openings Ha, one for each opening ill and in registry therewith (one opening Ila only being shown). A gasket IIb is positioned between the plate I I and member 9a to prevent leakage of the liquid Suppludtq the adjacent opening. The wall of each opening IIa is threaded to receive the threaded end of a liquid supply nozzle I2 (see Fig. la) forming part of a liquid screening and reducing device, indicated as an entirety at I3, through which the liquid iiows to the adjacent opening I El. Each opening l0 adjacent its opposite or discharge end is provided with screw threads to receive and mount the threaded inner end portion of a vapor discharge nozzle member I4 formed at its outer end with a discharge port Ida. As shown, each opening IB between the liquid screening and reducing supply device I3 and nozzle member I4 forms a chamber the walls of which are adapted to be preheated to a predetermined degree of temperature and maintained at such temperature, whereby the liquid discharged into the chamber is vaporized and the vapor discharged through the port la for escape through the opening Ic, the vapor being used to secure various beneficial results, dependent on the character of the liquid supplied to the tank 3, as hereinbefore referred to. Y

The heating means are disposed within the member Ba to facilitate manufacture and assembly thereof, to simplify the construction and to insure quick heating of the material of which the member is formed, as well as to economize on the current supply. rlhe heating meansare so arranged that the walls of all of the chambers i9 are simultaneously preheated and maintained at the desired temperature. 1n the arrangements shown, the heating means consist of the following: E5 indicates a plurality of recesses disposed parallel to the openings la and extending inwardly from the front end of the member 9a. As shown in Figs. 2 and 3, the recesses I5 are unformly spaced around the axis of the member 9a, each disposed equal distances from the adjacent openings ID. By preference, the axes of the recesses I5 are disposed on the same radii and on radii equal to that of the openings IB. Each recess I5 removably encloses and supports a heat generating unit I5. As will be observed, the heat generating units It operate to heat the metal of the member 9a, so that the Walls of the OPGHDES ID become heated and in turn vaporize the liquid supplied to the openings. By reason of the positioning of the heating units I6 and vapcrizing chambers I0, as above set forth, the heat energy generated by the units I5 and transmitted by conduction to the walls of the chambers I5, is applied to the latter uniformly, whereby these walls will be preheated in substantially the same period of time to a predetermined degree of tem-` perature and maintained at that degree. The vapor expands and flows out through the ports' Ica. The heat generating units I 6, as illustrated, are of the electrical resistance type, each unit consisting of an elongated rod 55a formed of suitable non-conducting material, on which a suitable resistance I5?) in coil form is spirally wound (see Figs. 7 and 8) and connected to leads I?, I'Ia, of an electrical circuit I8. The rod Ita is suitably mounted in and extends from end to end of a casing Ic, the side wall of which is formed of high heat conducting metal. The outer end of the casing Ic is closed by a disk Itri of suitable insulating material, Whereas its opposite or inner end is closed by a block 16e preferably formed of ceramic material and supporting the leads Il, I'ia. A member Iiif formed of insulating material is provided on the inner side of the block Ie. The member If is formed with openings through which the leads in sepawith and preferably of a length to extend substantially from end to end of the adjacent recess.

I9 indicates a separate recess disposed parallel tothe openings Ill Vand recesses I5 and extending inwardly from the front end of the member 9a. Thexrecess I9 encloses and removably supports a shell I9@ in which is mounted a normally closed thermo-controlled switch, indicated as an entirety at 20. The recess I3 is preferably disposed axially of the member da, so as to be equally spaced from all of the heat'generating units I6. The vshell ISa is formed of relatively thin sheet metal havingr high heat conductivity and adapted to expand endwise under the influence cf heat, such expansion serving to separate the switch contacts, as later set forth. The shell Iga is sealingly closed at its outer end by a plate I9?) formed of insulating material and sealingly closed at its inner end by a tting Ilc formed of insulating material. 2I indicates a pair of contacts, within the shell lila and connected to leads 22, 22a, connected in a circuit I3 to control the operation of a motor Ix, which is later referred to. The contacts 2I are normally in engagement so that the circuit I8 is closed but are adapted to be disengaged by the expansion of the shell I9a, to connect in the circuit for the pump motor |831, as later set forth. The contacts 2l are supported on and suitably insulated from the outer ends of pairs of arms 2Id, 2 Ib, respectively, which in turn are suitably fixed at their inner ends to abutments 23, 23a, respectively. The abutment 23 is suitably mounted on and secured to a pin 24 fixedly supported in the plate ISb, whereas vthe abutment 23a is suitably mounted on and secured to a rod 25 extending into and having screw threaded connection with the inner wall of a hollow screw 2s in turn extending through and having threaded connection with an opening ISc, formed in the tting |99, whereby the screw 26 may be adjusted endwise in the latter. The supporting arms 2Id, E lb, are formed of resilient metal and each arm of. one pair and the corresponding arm of the other pair support one of the contacts 2|. Also, it will be observed that the arms supported on each abutment 23,

23a diverge toward their outer' ends, so that by adjusting the abutment 23a relative to the abutment 23, the contacts ZI will be normally maintained in yielding contact, but upon expansion of the shell Isa, the abutment 23a will move toward the right (as viewed in Fig. 5) relative to the abutment 23, the effect of which is yto swing the arms outwardly and effect a disengagement of the contacts one from the other, to open the circuit I8. By adjustment of the abutment 23a the spring pressure engagement between the contacts 2| can be increased or decreased with respect to the endwise expansion of the shell I da in response to the heating oi` the member ila to a predetermined degree of temperature, dependent upon the kind of liquid A employed in the tank 3. Where a relatively lovv temperature is required, the vrelative adjustment of the abutments 23, 230 will be such as to effect disengagement of the contacts upon slight 'expansion of the shell lea.

Where a higher temperature is required, the abutment 23a will be set to maintain the contacts under a higher degree of spring tension, so that the shell l 9a is required to expand a greater distance in order to effect disengagement of the contacts 2|. By reason of the adjustments for the abutmentv 23a, the operation of the contacts 2l to open and close the circuit I8 in response to the expansion of the shell I9a, may be controlled within a relatively small range of temperature variation.

The member '9a is mounted within and in spaced relation to the walls of an inner casing 21, having top and side walls 21a, a bottom wall 2lb and end walls 21o, the space surrounding the member 9a and between it and the walls 21a, Zib, 21o, being filled with non-heat conducting materialpreferably glass wool 28. As shown in Figs. 1 and 2, the front end wall Zic is formed with an opening 21e alined with'the opening Ie, to accommodate the nozzle members Ie and wires for the heating units I5 and thermo-switch 26. The rear portion of the bottom wall 2lb rests on the top wall of the tank 3, whereas its front end portion engages the wall 5:0 and an angie xed to with an opening to accommodate the liquid screening devices I3. The member Sa is supported within the heating insulating material 28 by a cradle 2E! consisting of an elongated member 23a of semi-circular shape in cross section and provided at and along its opposite ends with extensions 22h having iianges 29e fixed to the side walls 27a and an inverted semi-circular member 29d provided at and along its opposite ends with extensions 29e removably secured to the 'extensions 29h by screws 30. The end walls 21o are flanged along their edges and t within the bottom, side and top walls of the inner casing 2l, the ilanges being removably secured to these walls by screws 30'.

Each of the liquid screening and reducing devices I3 consists of the following: Ilia indicates a hollow intake member having at its inner end a wall I3b formed with a screw threaded opening b in which a coupling 32 on the adjacent liquid supply pipe 33 is moimted. The inner wall of the member I3d, inwardly of its outer end, is provided with screw threads to receive the inner screw threaded end I2a of the nozzle I2, whereby the latter closes the member i3d and provides a liquid receiving chamber 13m. The nozzle AI2 is elongated and provided at its outer end with a wall I2b formed with a discharge port (see Fig. la), the inner side of the wall 12b sur rounding the port being of conical shape to form a seat for the head on the end of a plunger IZc. Theinner wall of the nozzle I2, adjacent its inner end is provided with screw threads to receive and adjustably support an inner hollow member I2d, in which the inner end of the plunger S20 is loosely and endwise movably supported. A spring 34 is coiled around the plunger I2c and abuts the inner end of they inner hollow member IZd and head of the plunger I2C to bias the latter endwise outwardly, to yieldably Ina-intain its head in engagement with its seat. As shown in Figs. la and 1b the head o the plunger 13o is formed with radially extending relatively small grooves providing for the ow ci the liquid to the discharge port of the nozzle l2. The side wall of the inner hollow member 12d is formed with a plurality of openings through which the liquid ows from the chamber I3a: into the member I2d and from the latter around the plunger I2c to the port of the nozzle I2. 35 indicates an annular screen surrounding the member IZd and held in position by the inner end of the nozzle I 2 and a head or flange on the outer end of the member |2cl.

The motor |811: consists of a frame 36 connected to the lower end of a hanger 33a which depends from a block of insulating material 35h suitably mounted in and closing an opening Vin the top wall 3b of the tank 3. The winding oi the pole for the motor |83: and the leads for the winding consists of enameled coated wire, whereby the motor may be submerged in the liquid in the tank 3. The leads are sealingly mounted in and extend through a grommet 31, which is preferably formed of rubber, sealed in an opening formed in the block 36D, the leads outwardly of the block being connected in a circuit, as later set forth. The motor I is provided with a shaded pole to effect self starting thereof. 3'ia indicates a pump supported by a bracket Sla: on the motor frame 36. The pump 31a consists of a casing member 3io having a cavity for a reciprocatable plunger 31o, which forces the liquid drawn into the cavity through an outlet into a discharge pipe 38, which is removably connected to the inner end of a coupling 38a suitably mounted in the block 36h. The outer end of the coupling 38a is connected to a conduit 38h. The conduit 38h is connected to the pipes 33, which in turn is connected to the devices I3, as already set forth. The upper end of the plunger 31o is connected by a link 31o to an eccentric fixed to the outer end oi the motor shaft l8r. The intake for the cavity in which the pump plunger 3io reciprocates is provided in the lower end of the casing member 31h and consists of a threaded opening for a screw 31d which is formed with a through duct (not shown) leading into the plunger cavity. The plunger cavity is formed with a by-pass (not shown), the capacity of which is controlled by a screw 3S (see Fig. 4) so as to regulate the ow of the liquid through the liquid connections leading to the devices I3.

4B indicates a suitable switch for the circuit i8. The switch 4U is of the time operated type having a movable member 40a which may be turned to a selected position, indicated by numbers, such as 5, 10, etc., (not shown) representing time periods in minutes, the contacts of the switch being controlled by a clock mechanism within the switch casing to break the circuit at the end of the selected time period. Accordingly, when the apparatus is positioned for operation in a room, the switch may be closed and set for a predetermined time period dependent on the volumetric area of the room and/or other conditions to be met, neutralized or overcome.

lThe circuit I8 includes a relay 40x (preferably mounted in the chamber on the wall S-see Fig. 1) and consists of a main circuit 4I, a separate circuit 42 and an auxiliary circuit 43. The main circuit 4I is traced as follows (see Fig. 9); positive supply line 4Ia, fuse 4m', lead 41h, contact 4|b' on the insulation block 44 (in chamber 4--see Fig. 1), lead 4Ic to hand 40a of time operated switch 4D, arcuate contact member 4ld, lead 4Ie, leads Il, Ila, to resistances of heatersy I6, lead 4If, contact 4Ig on block 44 lead 4|hl to negative line 4Ii. The separate circuit 42 is traced as follows: lead 42a, connected to lead 4Ie, contact 42h, lead 42e, lead 22, contacts 2|, lead 22a, lead 42d, coil of relay 40x, lead 42e which is connected to lead 4| f. The auxiliary circuit 43 is traced as follows: lead 43a, which is connected to lead 4Ie and the armature 40m of the relay 40x terminal 432), lead 43o, motor l8r, lead 43d, lamp 45, lead 43e, contact 437e and lead 43g to lead 41h. The lamp 45 is connected in series in the auxiliary circuit 43 to indicate the closing of that circuit and operation of the motor l8r to drive the motor therefor.

Operation: it will be observed that when the time operated switch 40 is in neutral or open circuit position (Fig. 4), the coil of the relay 40a; is de-energized and that the relay armature 40x' under the inuence of the spring 4Gb, connects the lead 43a to the terminal 43h of the auxiliary circuit 43, as shown in full lines in Fig. 9, and that the contacts 2| of the thermostat are engaged as shown in Fig. 5. If the time operated switch is operated to a selected position (see dotted lines in Fig. 9), electric current will be supplied to the resistances of the heat units I6, which are connected in the main circuit 4I, and through the contacts 2l of the thermostat and coil of the relay 40x, which contacts and coil are connected in the separate circuit 42, to energize the coil, which in turn will substantially instantly operate the armature to the dotted line position, as shown in Fig. 9, to break the auxiliary circuit 43. Upon the heating of the member 9a, by the resistances of the heating units i6, to a predetermined degree of temperature (which degree of temperature may be selected by a pre-adjustment of the thermostat as already set forth), the thermostat casing will expand endwise and effect a disengagement of the contacts 2l, thereby opening the circuit 42 and deenergizing,r 'the coil of the relay 49m, whereby the relay armature will close the auxiliary circuit 43 to supply current to the motor l8r and operate the pump 3l.

It will therefore be noted that 'the driving of the motor and operation of the pump to supply liquid to and through the devices I3 to the openings IIJ` is dependent on the heating of the walls of the openings I3 to the predetermined degree of temperature; that is, that degree of temperature that is capable of vaporizing the liquid and to continue to effect vaporization, so that the liquid may be continuously supplied to the openings, vaporized and discharged by the nozzles I4. The continuous supply of the liquid at a predetermined rate is readily provided for Yby adjustment of the by-pass in the pump and delivery of the liquid in a relatively fine stream from each nozzle I2 into the adjacent opening I9.

By preference, the member 9a is of large size to provide an adequate mass of metal to be heated and is embedded or encased in a jacket 0r body of heat insulating material, whereby loss of heat by radiation or otherwise is reduced to a minimum.

It will also be observed that the apparatus is enclosed, except for the vapor discharge opening Ic, and when set in operation by the time operated switch, the apparatus works automatically to initially heat the member 9a, to a predetermined degree of temperature, operate the pump motor and then open the circuits to the heating units IS and pump motor at the end of the selected time period. Accordingly, the tank 3 may be iilled with a quantity of liquid, tne apparatus positioned in a room and set in operation by an operator and, after the operator has made his exit from the room, the room may be rthermo-controlled sealed against the escape of vapor, air and other gaseous mediums, ii any. It is to be observed that the supply lines may be connected to an electric current source outside the room and provided with a separate switch; in this arrangement, after the apparatus is' positioned in the room the time operated switch may be set at the selected position, the room sealed, and thereafter the separate switch is closed, whereupon the apparatus will work automatically as above set forth. It will also be observed that the time operated switch, instead of being mounted on the casing I, may be connected in the supply lines at a point remote from lthe casing and operated after the apparatus is positioned in a room and the latter sealed.

To those skilled in the art to which my invention relates, many changes in construction and Widely diiiering embodiments and applications of the invention will suggest themselves without departing from the spirit and scope of the invention. My disclosures and the description herein are purely illustrative and are not intended to be in any sense limiting.

What I claim is:

1. In apparatus for spraying vaporized liquid, the combination of a member formed of material having a high co-eihcient of heat conductivity, said member being formed with a chamber adapted to receive the liquid to be sprayed and a recess, an inlet for said chamber, an outlet for said chamber consisting of a discharge nozzle, the walls of said chamber, when heated, serving to vaporize the liquid delivered thereto for discharge through said nozzle, a tank for holding a supply of the liquid, liquid connections between the lower portion of said tank and said inlet, a motor driven pump for inducing a flow of the liquid through said connections andY inlet into said chamber, and means within said recess for f heating the walls of said chamber.

2. An apparatus as claimed in claim l wherein said heating means consist of a resistance in said recess adapted to be connected with a source of electric current supply.

3. vIn apparatus of the class described, the combination of a member formed of material having a high co-eiicient of heat conductivity, said member being formed with a recess and a chamber adapted to receive liquid, an inlet for said chamber, an outlet leading therefrom, the walls of said'chamber, when heated, serving to vaporize the liquid delivered thereto for discharge through said outlet. a 'tank for holding asupply of liquid, liquid connections between the Vlower portion of said tank and said inlet, a pump for inducing a flow of liquid under pressure vthrough said connections and inlet into said chamber, a means for heating said member, an electric motor for driving said pump, an electric circuit connected to said motor, a source of current supply for said circuit, and a normally open switch for said circuit mounted in said recess, and adapted to close the circuit to operate said motor when said member I-i-s heated to a predetermined Ydegree of temperature.

4. In apparatus for spraying vaporized liquid, the combination with a housing having an outlet in one side thereof, of a tank for holding a supply of the liquid to be vaporized, mounted within said housing, a member mounted within said housing and formed of a material having a high coefficient of heat conductivity, said member being formed with a through opening the outlet end of which is in alinement with said outlet, a liquid supply connection leading from 'the interior of said tank and connected to that end of said opening, remote from said outlet, a closure for the outlet end of said opening and formed with a discharge port through which the vaporized liquid is discharged, a pump for inducing a flow of liquid under pressure through said connection to said opening, and heat generating means for heating the material of said member to heat the walls of said opening, to effect vaporization of the liquid supplied thereto.

5. An apparatus as claimed in claim 4 wherein said heat generating means consist of a recess formed in said member, an electrical resistance mounted in said recess and a source of electric current supply comiected to said resistance.

6. In apparatus of the class described, the combination with a housing having an outlet in one side thereof, of a tanl; for holding a supply of liquid mounted within said housing, a member mounted within said housing and formed of a material having a high co-efcient of heat conductivity, said member being formed with a through opening, a liquid supply connection leading from the interior of said tank and connected to that end of said opening, remote from said outlet, a closure for the opposite end of said opening formed with a discharge port alined with said outlet, a pump for inducing a low of liquid under pressure through said connection to said opening, an electric motor for driving said pump, an electrical resistance mounted within said member for heating the material of said member to heat the Walls of said opening, to effect vaporization of the liquid supplied thereto, a circuit for said motor and resistance connected to a source of electric current supply, and a time controlled switch in said circuit arranged to close the circuit and automatically open the circuit at the end of a predetermined time period.

'7. In apparatus of the class described, the combination with a housing having an outlet in one side thereof, of a tank for holding a supply of liquid mounted within said housing, a member mounted within said housing and formed of a material having a high co-eincient of heat conductivity, said member being formed with a through opening, a liquid supply connection leading from the interior of said tank and connected to 'that end of said opening remote from said outlet, a closure for the opposite end of said opening formed with a discharge port alined with said outlet, a pump for inducing a flow of liquid under pressure through said liquid connection to said opening, and heat generating means for heating the material of said member to heat the walls of said opening, to eiect vaporization of the liquid supplied thereto, said heat generating means consisting of a recess formed in said member, an electrical resistance mounted in said recess, a circuit for said resistance, a source of electric current supply connected to said circuit, an electric motor for driving said pump, a separate circuit for said motor, and a thermo-operated switch mounted in said member and controlled by the heating thereof to a predetermined degree of temperature to connect said separate circuit to said source of electric current supply to operate said motor.

8. An apparatus as claimed in claim 7 wherein said thermo-operated switch operates to connect said separate circuit to said rst mentioned `circuit and a time operated switch is provided in said rst mentioned circuit for closing it and to automatically open said circuit at the' end of 'a predetermined time period.

9. In an apparatus for spraying a vaporized liquid, the combination with a support, of a tank on said support for holding a supply of liquid, an

,elongated member formed of a material having a 'of recesses disposed parallel to said openings and each disposed between and equally spaced from adjacent openings, supply nozzles mounted in corresponding ends of said openings and having .supply connections with said tank, closures for `the opposite ends of said openings, each of said closures being formed with a discharge port -through which the vaporized liquid is discharged,

a motor driven pump for inducing a flow of liquid from said tank through said connections to said nozzles, electrical resistances in said Y recesses arranged when energized to heat the walls of said openings, whereby the liquid supplied to said openings is vaporized and discharged through said ports, a circuit for said resistances and the motor, and a source of electric current supply connected to said circuit.

10. In an apparatus for spraying a vaporized liquid, the combination with a support, of a tank on said support for holding a supply of liquid, an elongated member formed of a material having a high co-efcient of heat conductivity, said member being formed with a plurality of through openings uniformly spaced about an axis extending longitudinally -of said member, a plurality of recesses disposed parallel to said openings and each disposed between and equally spaced from adjacent openings and a separate recess, supply nozzles mounted in corresponding ends of said openings and having supply connections with said tank, closures for the opposite ends of said openings, each closure being formed with a discharge port, a motor driven pump for inducing a ow of liquid from said tank through said connections to said nozzles, electrical resistances in said recesses arranged when energized to heat the walls of said member, whereby the liquid supplied to said openings is vaporized and discharged through said ports, a source of electric current supply, a main circuit for said resistances connected to said source of current supply, a separate circuit for the motor which drives said pump, and a thermo-controlled switch mounted in said separate recess and having leads connected to said main and separate circuits to connect the latter circuit to said main circuit, wherebyV said separate circuit is connected to said source of electric current supply, said switch being arranged to connectl said separate circuit to said main circuit due to heating of the walls of said member to a predetermined degree of temperature.

11. An apparatus as claimed in claim wherein said thermo-controlled switch consists of a hollow sheet metal casing capable of expanding endwise under the iniiuence of heat and provided with closures at its opposite ends, a pair of contacts within said casing and relatively movable supports for said contacts mounted on said closures, one of said closures being adjustable endwise of said casing.

12. An apparatus as claimed in claim 10 wherein said main circuit is provided with a time operated switch arranged to open said circuit at Vthe end of a predetermined time period.v

13. An apparatus as claimed in claim 1 wherein the motor and the pump are submerged in the liquid in said tank and said pump is provided with an adjustable by-pass to regulate the output thereof for supply to said chamber.

14. In an apparatus for spraying vaporized liquid, the combination of a member formed of metal and formed with a horizontally disposed through opening and a recess open at one end, a fitting mounted in the inner end of said opening and formed with a discharge port through which liquid is discharged into said opening, pressure reducing devices in said tting arranged to maintain a substantially uniform rate of liquid supply to said port, a nozzle connected to the opposite end of said opening, a tank for holding a quantity of liquid to be vaporized, a conduit leading from said tank to said tting, a pump in said tank connected to said conduit and arranged to induce liquid flow therethrough under pressure to said fitting, an electric motor for driving said pump, a resistance mounted in said recess, and an electric circuit for said resistance and said motor and adapted to be connected to a source or electric current supply, said resistance, when energized, serving to heat the walls of said opening and vaporize the liquid supplied to said opening.

15. In an apparatus for spraying vaporized liquid having, in combination, a member formed of metal and having a horizontally disposed through opening and a recess open at one end, a fitting for supplying liquid at a substantially uniform rate to the inner end of said opening, a nozzle mounted in the opposite end of said opening, a tank for holding a quantity of the liquid to be vaporized, a conduit leading from said tank to said tting, a pump in said tank connected to said conduit and arranged to induce liquid flow therethrough under pressure to said tting, an electric motor for driving said pump, a resistance mounted in said recess, an electric circuit for said resistance and said motor and adapted to be connected to a source of electric current supply, said resistance, when energized, serving to heat the walls of said opening and vaporize the liquid supplied to said opening, and a time switch in said circuit for closing it and arranged to open said circuit at the end of a predetermined time period.

16. In an apparatus for spraying vaporized liquid having, in combination, a member formed of metal and having a horizontally disposed through opening and a recess open at one end, a fitting for supplying liquid at a substantially uniform rate to the inner end of said opening, a nozzle mounted in the opposite end of said opening, a tank for holding a quantity of the liquid to be vaporized, a conduit leading from said tank to said fitting, a pump in said tank connected to said conduit and arranged to-induce liquid flow therethrough under pressure to said tting, an electric motor for driving said pump, a resistance mounted in said recess, and an electric circuit for said resistance and said motor and adapted to be connected to a source of electric current supply, said resistance, when energized, serving to heat the walls of said opening and vaporize the liquid supplied to said opening, said circuit being with a switch and consisting of a main circuit, a separate circuit connected to said main`circuit and an auxiliary circuit, said resistance being connected in said `main circuit and said motor being connected in said auxiliary circuit, a thermo-controlled switch and a relay connected in said separate circuit,

13 Said thermo-controlled switch serving te control the operation of said relay and said relay serving to control the connection of said auxiliary circuit to said main circuit.

HAMILTON R. STAGNER.

REFERENCES CITED The following references are of record in the l0 le of this patent:

Number 14 UNITED STATES PATENTS Name Date Batchelder Mar. 5, 19.12 Hill July 4, 1916 Neri June 5, 1923 Fitzer Apr. 13, 1926 Vinz Dec. 18, 1934 Beyrodt Jan. 31, 1939 Erickson Aug. 1, 1939 McIlrath July 1, 1941 Shepperd et. al. Mar. 10, 1942 

